Merge actor creates meshes with 0 triangles and error in output log… basically merge actor works correctly if you set the LOD to force generate with LOD 0 , but if you leave it on all or auto or wahtever it makes the 0 poly triangle model and an error blaming one of the meshes… But its pretty much any of hte meshes… not specific to them…
Found this bug due to my problems with HLOD …